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Current Affairs January 2024

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4

The secondary fuel used in nuclear power plants is

A. U₂₃₃ and Pu₂₃₉

B. U₂₃₅ and Th₂₃₂

C. U₂₃₅ and Pu₂₃₈

D. U₂₃₃ and Pu₂₃₈

Correct Answer :

A. U₂₃₃ and Pu₂₃₉


Related Questions

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For economical operation of a nuclear plant

A. Used fuel should be reprocessed

B. Moderator should be used

C. Coolant should be employed

D. Control rods should be used

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A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is

A. Same

B. More

C. Less

D. There is no such criterion

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Effective moderators are those materials which contain

A. Light weight atoms

B. Heavy weight atoms

C. Critical atoms

D. Zero weight atoms

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Half life of a radioactive isotope corresponds to the time required for half of the following to decay

A. Electrons

B. Protons

C. Neutrons

D. Atom

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When a reactor becomes critical, then the production of neutrons is

A. Infinite

B. Zero

C. Exactly balanced by the loss of neutrons through leakage

D. Initiated

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Hydrogen is preferred as better coolant in comparison to CO₂ because former

A. Is lighter

B. Is inert

C. Has high specific heat

D. Is a good conductor

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A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to

A. Slow down the speed of fast moving neutrons

B. Control the reaction

C. Reduce the temperature

D. Extracts heat from nuclear reaction

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The energy required to be applied to a radioactive nucleus for the emission of a neutron is

A. 1 MeV

B. 2.4 MeV

C. 4.3 MeV

D. 7.8 MeV

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Plutonium is produced

A. As basic raw material

B. By neutron irradiation of Uz

C. By neutron irradiation of thorium

D. Artificially

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A nuclear unit becoming critical means

A. It is generating power to rated capacity

B. It is capable of generating much more than rated capacity

C. There is danger of nuclear spread

D. Chain reaction that causes automatic splitting of the fuel nuclei has been established

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In boiling water reactor, moderator is

A. Coolant itself

B. Ferrite rod

C. Graphite rod

D. Liquid sodium metal

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Ferrite material is

A. The most fissionable material

B. The basic fuel for nuclear paints

C. Basic raw material for nuclear plants

D. The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

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4

A fission chain reaction in uranium can be developed

A. By increasing the contents of U₂₃₅

B. By slowing down fast neutrons so that U₂₃₅ fission continues by slow neutron

C. Both (A) and (B)

D. None of these

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4

One gram of uranium will produce energy equivalent to approximately

A. 1 tonne of high grade coal

B. 4.5 tonnes of high grade coal

C. 10 tonnes of high grade coal

D. 100 tonnes of high grade coal

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Reactors for propulsion applications use

A. Natural uranium

B. Molten lead

C. Any form of uranium

D. Thorium

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The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be

A. More

B. Less

C. Same

D. Zero

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Enriched uranium may contain fissionable contents of the order of

A. 1-99 %

B. 1-25 %

C. 1-50 %

D. 1-75 %

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Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal

A. Centrifugal

B. Axial

C. Reciprocation

D. Electromagnetic

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The unit of radioactivity is

A. Electron volt

B. Electron ampere

C. Curie

D. MV

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In triggering fission, the following types of neutrons are desirable

A. Fast moving

B. Slow moving

C. Critical neutrons

D. Neutrons at rest

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Each fission of U₂₃₅ produces following number of fast neutrons per fission

A. 1 neutron

B. 3 neutrons

C. 1, 2 neutrons

D. 2 neutrons

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Which is not identical for an atom and an isotope?

A. Mass number

B. Atomic number

C. Chemical properties

D. Position in periodic table

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The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is

A. Higher cost of nuclear fuel

B. High initial cost

C. High heat rejection in condenser

D. Lower temperature and pressure conditions

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Reflector in nuclear power plants _________ neutron leakage.

A. Increases

B. Decreases

C. Have no effect on

D. None of these

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Fast breeder reactor uses

A. Boiler

B. Direct cycle of coolant system

C. Double circuit system of coolant cycle

D. Multi passes system

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A fast breeder reactor uses

A. 90% U₂₃₅

B. U₂₃₈

C. U₂₃₅

D. Pu₂₃₉

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Pick up the wrong statement fast breeder reactors

A. Operate at extremely high power densities.

B. Are liquid metal cooled

C. Produce more fuel than they consume

D. Use water as coolant

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The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration is

A. Plutonium

B. Uranium

C. Deuterium

D. Thorium

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Which of the following is more appropriate for a moderator? One which

A. Does not absorb neutrons

B. Absorbs neutrons

C. Accelerates neutrons

D. Eats up neutrons

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In nuclear fission

A. The original elements change into completely different elements

B. The electrons of the element change

C. The molecules rearrange themselves to form other molecules

D. None of the above